Model comparison
Solar Pro4 vs Step 3.7 Flash
Solar Pro4 is the stronger model overall, scoring 42.1 to 37.3 on the Noometry Index.
Last verified . 0 shared benchmarks.
Upstage
StepFunSummary
- The widest gap is in reasoning, where Solar Pro4 leads 28.5 to 21.6.
- Step 3.7 Flash is cheaper at $0.18 / $1.11 per million input/output tokens, against $0.30 / $1.20 for Solar Pro4.
- Solar Pro4 accepts more context: 524K tokens versus 256K.
- Step 3.7 Flash has downloadable open weights; the other is API-only.
Side by side
| Solar Pro4 | Step 3.7 Flash | |
|---|---|---|
| Provider | Upstage | StepFun |
| Noometry Index | 42.1 | 37.3 |
| Released | 2026-08-06 | 2026-05-29 |
| Weights | Proprietary | Open |
| Context window | 524K | 256K |
| Max output | 131K | 256K |
| Input $ / M tokens | $0.30 | $0.18 |
| Output $ / M tokens | $1.20 | $1.11 |
| Results tracked | 18 | 5 |
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Category by category
Coding Too close to call
Solar Pro4: 40.1 (#149), Step 3.7 Flash: 40.0 (#150)
| Benchmark | Solar Pro4 | Step 3.7 Flash |
|---|---|---|
| LMArena WebDev | 1371 | — |
| SciCode | — | 40% |
| LMArena Coding | 1437 | — |
| ALE-Bench | — | 694.12 |
Reasoning Solar Pro4 leads
Solar Pro4: 28.5 (#104), Step 3.7 Flash: 21.6 (#219)
| Benchmark | Solar Pro4 | Step 3.7 Flash |
|---|---|---|
| NYT Connections (extended) | — | 39.7% |
| CritPt | — | 2.3% |
| LMArena Hard Prompts | 1399 | — |
Math Step 3.7 Flash leads
Solar Pro4: 38.8 (#128), Step 3.7 Flash: 42.9 (#82)
| Benchmark | Solar Pro4 | Step 3.7 Flash |
|---|---|---|
| MathArena Final-Answer Competitions | — | 68.5% |
| LMArena Math | 1416 | — |
Knowledge Not comparable
Solar Pro4: 39.8 (#129), Step 3.7 Flash: —
| Benchmark | Solar Pro4 | Step 3.7 Flash |
|---|---|---|
| LMArena Expert | 1427 | — |
Multilingual Not comparable
Solar Pro4: 48.7 (#139), Step 3.7 Flash: —
| Benchmark | Solar Pro4 | Step 3.7 Flash |
|---|---|---|
| LMArena Non-English | 1361 | — |
| LMArena Chinese | 1415 | — |
| LMArena French | 1397 | — |
| LMArena German | 1364 | — |
| LMArena Japanese | 1309 | — |
| LMArena Korean | 1382 | — |
| LMArena Russian | 1360 | — |
| LMArena Spanish | 1401 | — |
Instruction Following Not comparable
Solar Pro4: 72.7 (#132), Step 3.7 Flash: —
| Benchmark | Solar Pro4 | Step 3.7 Flash |
|---|---|---|
| LMArena Instruction Following | 1377 | — |
Long Context Not comparable
Solar Pro4: 42.1 (#130), Step 3.7 Flash: —
| Benchmark | Solar Pro4 | Step 3.7 Flash |
|---|---|---|
| LMArena Longer Query | 1381 | — |
Writing & Preference Not comparable
Solar Pro4: 56.5 (#138), Step 3.7 Flash: —
| Benchmark | Solar Pro4 | Step 3.7 Flash |
|---|---|---|
| LMArena Text | 1386 | — |
| LMArena Creative Writing | 1316 | — |
| LMArena Multi-Turn | 1385 | — |
Frequently asked questions
Is Solar Pro4 better than Step 3.7 Flash?
Solar Pro4 is the stronger model overall, scoring 42.1 to 37.3 on the Noometry Index.
Which is cheaper, Solar Pro4 or Step 3.7 Flash?
Step 3.7 Flash is cheaper. It lists at $0.18 per million input tokens and $1.11 per million output tokens; Solar Pro4 lists at $0.30 and $1.20.
Is Solar Pro4 or Step 3.7 Flash better for coding?
They score almost the same on coding (40.1 vs 40.0); test both on your own repository before choosing.
Which has the bigger context window?
Solar Pro4 does, with 524K tokens against 256K.
How many benchmarks do Solar Pro4 and Step 3.7 Flash share?
0 benchmarks have published results for both models. Solar Pro4 has 18 scored results on Noometry and Step 3.7 Flash has 5.